Java Edition 1.21 Pre-Release 1

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1.21 Pre-Release 1 (known as 1.21-pre1 in the launcher) is the first pre-release for Java Edition 1.21, released on May 29, 2024,^[1] which fixes bugs and makes changes to portals.

Enchantments

• lookup
  • A "Level-Based Value" type that maps a list of values to specific levels, and applies a fallback if the level is greater than the number of values supplied.
  • Fields:
    • values: A list of values indexed by level - 1 to apply, if present.
    • fallback: A fallback level-based value to apply if the level is greater than the size of values.

Ominous trial spawner

• Mobs removed by a trial spawner converting to ominous state now drop any items they previously picked up from the ground.

Mace

• Attack speed has been changed to 0.6.

Boats

• Are now leashable.

Obsidian platform

• When re-generated when a new player enters the End portal, instead of breaking all blocks 3 blocks above it the blocks are instead broken as if mined by a player, dropping the item and (if a container) all its contents.

Wind Burst

• Now bounces the player a further 7 blocks up per enchantment level, for 21 blocks at level 3.^[2]

Data pack

• The pack format version is now 46
• Added new configurable fields to jigsaw structures and single_pool_element types.

Debug

• The game now stores reports from failed chunks' loads and saves in the debug directory.

Effect conditions

• Unlike with loot tables, all effect conditions now need to be inline objects and cannot be references.

Loot tables

• random_chance_with_enchanted_bonus
  • chance field has been removed.
  • unenchanted_chance: a new field for the chance for an unenchanted item.
  • enchanted_chance: a new field for the chance for an enchanted item; a level-based value.

Portals

• Ender pearls that are thrown through portals can now teleport players to a different dimension than the one they are currently in.
• It is now possible to travel with rideable entities through portals.
  • When riding entities through portals, the delay before teleporting is not applied.

Reporting

• Report data generator now includes information about network packets.

Server links

• There are some generic-use link names, like "Support" or "Website", without any special functionality.​^{[more information needed]}

Structures

• Added liquid_settings field to structures of type minecraft:jigsaw.
• Possible values:
  • apply_waterlogging: If any waterloggable block overlaps with existing water, it will become waterlogged.
  • ignore_waterlogging: Will not waterlog any waterloggable blocks that overlap existing water.
    • Default value is apply_waterlogging.
• Added optional field override_liquid_settings to single_pool_element element type.
  • Same possible values as the liquid_settings in jigsaw structures.
  • Overrides the inherited liquid settings from the parent jigsaw structure while generating this pool element.

Tags

• The fire_aspect_lightable block tag was removed.

Enchantments

• Removed the functionality of Fire Aspect being able to light blocks on fire.
  • Mojang has stated that this feature has been temporarily removed for refinement, and will be reintroduced in a later release.^[1]

Gamerules

• Removed the entitiesWithPassengersCanUsePortals gamerule that was introduced in 24w21a.
  • Entities with passengers being able to use portals is now the default behavior.

Tags

• The fire_aspect_lightable block tag was removed.

79 issues fixed

From released versions before 1.21

• MC-902 – The End obsidian platform resets every time entities go through the End portal, which can cause blocks to be deleted.
• MC-8983 – Primed TNT cannot travel through nether portals.
• MC-50612 – Command blocks do not update when you place them near any source of power.
• MC-97087 – Attributes won't work in main hand if they were in offhand.
• MC-114566 – Can't teleport back to the central island with End gateway portal on outer End islands.
• MC-148741 – Selection boxes in some screens are misaligned in comparison with their text.
• MC-160140 – Shulker boxes on the obsidian platform are destroyed and do not drop when a player enters the End.
• MC-169698 – Blocks within igloo basements can generate waterlogged when generating in close proximity to water.
• MC-170907 – Network position deltas are processed relative to a wrong point.
• MC-172031 – Throwing an ender pearl into a nether or End portal often has no effect.
• MC-191591 – Saddles lose their NBT data when equipped on horses, zombie horses, skeleton horses, mules or donkeys via right-clicking.
• MC-225870 – Breeding an axolotl in Creative replaces the bucket of tropical fish.
• MC-265583 – Incorrect pluralization for skin customization strings for pants.
• MC-265818 – The "gamerule.doVinesSpread.description" string consists of grammatically incorrect word usage.
• MC-266140 – The "Open link" button within the Realms menu is improperly capitalized.
• MC-266471 – Trial chambers can intersect aquifers, causing some blocks inside the structure to be waterlogged.
• MC-267050 – Chat disabled strings are missing verbs.
• MC-267071 – The word "packs" within the "download.pack.failed" string is always pluralized.
• MC-267474 – Strings referencing the player's off hand are inconsistently spelled.
• MC-267954 – World upgrade and downgrade Realms strings are improperly capitalized.
• MC-268023 – The "selectWorld.experimental.details.title" string displayed within the experimental features details menu is improperly capitalized.
• MC-268185 – Copper grates in trial chambers are waterlogged.
• MC-269439 – Some diacritics intersect the language box in the languages menu.
• MC-269617 – When ender pearls teleport non-player entities, no teleportation sound is played upon impact.
• MC-269921 – Wind charges can be thrown though corners.
• MC-270181 – Wind charges go through an entity if it is close to a player.
• MC-270572 – Programmer Art resource pack duplicates some GUI texture files.
• MC-270649 – The width of challenge advancements header is calculated in relation to the slash formatting of progress counter, causing overlap in some languages.
• MC-270795 – Mobs despawned by ominous trial spawners can delete picked up items.
• MC-270821 – Regular trial spawners spawn the first mob with ominous trial equipment if they were last active as ominous.
• MC-270981 – View Bobbing toggle is not available in Accessibility Settings.
• MC-271293 – Wind charge, fireball and shulker bullet makes a "Burning" sound as it passes through the lava.
• MC-271446 – Mace attack speed was lowered to a point where all Wind Burst smash attacks are performed on uncharged attacks.
• MC-271897 – End portal makes items disappear.
• MC-272014 – Ender Dragon death animation is broken since 20w22a (and broken again in 20w45a).
• MC-272073 – Item displays with billboard and rotation values create major visual bug.
• MC-272079 – Medium/small slimes and magma cube's attack reach is too short.
• MC-272198 – Shulkers' models sometimes appear offset upon End city generation.
• MC-272253 – The strength of the Riptide enchantment is increased when holding tridents enchanted with Riptide in both hands.
• MC-272267 – "Changes the blurriness of menu background" lacks punctuation.
• MC-272279 – Resource packs containing TrueType fonts fail to load on x64 macOS systems.
• MC-272308 – Axolots can be attached to new leads when being already leashed.
• MC-272445 – Command blocks made from + Pick Block do not activate on first try.
• MC-272469 – When the wind charge, fireball or shulker bullet is in the lava, it will continue to make a high-loudness noise.
• MC-272515 – Component-modified saddles get their components wiped when dispensed onto a horse, mule, or camel.

From the 1.21 development versions

• MC-271870 – random_chance_with_looting function base value is for enchantment level 1.
• MC-271929 – Applying multiple layers of "using_converts_to" will produce ghost items.
• MC-272038 – The error "Can't access registry ResourceKey[minecraft:root / minecraft:game_event]" is sometimes in the log file.
• MC-272053 – The "armor_effectiveness" effect does not work with projectiles or indirect damage.
• MC-272258 – block.portal.travel sound now plays when teleporting to a different dimension using commands.
• MC-272264 – Narrator button in Accessibility Settings doesn't update upon pressing + .
• MC-272311 – The enchantment glint sometimes doesn't render in interfaces and first person.
• MC-272313 – The game crashes when attempting to open the Realms menu.
• MC-272315 – Serial comma is missing from the entitiesWithPassengersCanUsePortals game rule description.
• MC-272322 – When the player is riding an entity through portals, the player and the entity may teleport to the wrong place.
• MC-272328 – entitiesWithPassengersCanUsePortals game rule description is missing the proper term capitalization.
• MC-272329 – Riding an entity into portals may cause the game to softlock.
• MC-272355 – Ellipsis text is stringified within NBT text formatter list truncation.
• MC-272424 – Chunks occasionally have large dark areas in the sky.
• MC-272430 – Breaking a carrot/warped fungus on a stick gives a damaged fishing rod.

From the previous development version

• MC-272339 – Holding crossbows in both hands stacks Quick Charge.
• MC-272342 – Typo in mining fatigue attribute ID "minecraft:effect.minining_fatigue".
• MC-272343 – Ender pearls don't work when riding an entity.
• MC-272344 – When teleported by an ender pearl, the "portal noise fades" sound is played.
• MC-272347 – Upgrading from before 24w21a doesn't update structures saved by structure blocks.
• MC-272361 – Minecarts and passengers offset from block when riding through portals.
• MC-272364 – Players spawn one block above the obsidian platform when entering an End portal.
• MC-272365 – Inventory images of all banners are completely white.
• MC-272369 – The player can respawn in a solid block with default spawnpoint.
• MC-272374 – 24w21b will not upgrade attribute_modifiers from previous versions.
• MC-272399 – Primed TNT entities can't go through an End portal anymore.
• MC-272400 – Shield in inventory with banner shows as white.
• MC-272403 – Portal linking chunk loading changes.
• MC-272406 – Crash when zombie tries to spawn second reinforcement.
• MC-272408 – set_attributes item modifier can add the same attribute modifier twice.
• MC-272427 – Flame, Power, Punch, and Piercing enchantments no longer work on the last use of the item.
• MC-272438 – End crystal entities can't go through an End portal anymore.
• MC-272442 – Comparator output of jukebox no longer persists on music disc finish.
• MC-272490 – @n can select dying entities, unlike @e.